Has anyone had a new primer pump go bad within a 1 month time span?
winmutt and I tried very hard to resolve a no-start issue last night. Finally had to throw in the towel when darkness prevailed. All fuel hoses correctly connected. Full tank of fuel. When pumping the primer, air bubbles kept coming from the lift pump. Even when trying to draw from a plastic cup, nothing. The pre-filter wouldn't even fill up. We determined that it was a fuel issue, though. The afternoon wasn't a total failure.
I also got to meet a fellow Benz traveler. Thanks again, winmutt.
He may chime in here.

The primer pump relies on the same valves as the primary fuel pump. You could have a malfunctioning suction or discharge valve.

It's amazing what a little teamwork can accomplish!!!

X2

Take a look here for an idea of how it all works:-

http://www.peachparts.com/shopforum/showthread.php?t=294499

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

The odd thing is that when I installed the primer pump two to three weeks ago, I pushed it once and it immediately filled the pre-filter and, I assume, the lift pump with fuel. The fuel, unfortunately, was full of crud, so I bought another pre-filter as a replacement. When I swapped them out a couple of days ago, pushing the primer pump would not even fill up the pre-filter. Why would it hold prime for two to three weeks and then, all of a sudden, not?

As previousl stated it could be one of the Valves in the Lift Pump not seating.

However, one of our members bought a New Style Bosch Hand Primer and it leaked. He went to the place where he bought it and exchanged it for anoter and that on also leaked.
He figured they had go a bad lot of Hand Primers so he went to another branch of the same Auto Part store and got another one that and that one was OK.

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84 300D, 82 Volvo 244Gl Diesel

When that new style primer leaked, was it visibly evident? I could not see any evidence of fuel spillage around my primer.

I think it was this thread:-

http://www.peachparts.com/shopforum/showthread.php?t=294601

But I might be wrong!

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

I was giving an example that even new parts can sometimes be no good.

__________________
84 300D, 82 Volvo 244Gl Diesel